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External Hard drive incorrect capacity

I recently had to run a reformat of my external hardrive to become compatible with a FAT32 system. I tried doing this twice. Half way through each session it told me that it could not format the entire drive.
After removing the USB External hard drive from the computer and re connecting it, I learned that instead of 250gig it was now only registering 31.5gig worth of space.
This is completely incorrect.

Is there anyway I can restore it to a cull capacity setting or is it ruined forever?

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Have you looked at the drive in Disk Management? It gives a graphic representation of the drive so you can see what else is there/missing. Always a good starting point. Hidden or unallocated areas will not normally show in Windows.

You can merge/delete partitions. I think you can do it in Disk Management but it's easier using partitioning software. I've recently been using EaseUS Partition Master. There are others, see this freeware list.

There is a size limit for FAT32 (depending on how the formatting is done). You may want to read this MS article.